Additional file 11.

PCA analysis for defining the number of groups in SOM. The difference between the magnitude of principal component eigenvalues for each treatment (columns) estimates how many groups are minimally necessary in each SOM grouping analysis. When the difference is near zero, there is no substantial information added by increasing the number of seed groups in SOM.

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Rocha et al. BMC Genomics 2007 8:71   doi:10.1186/1471-2164-8-71